A finite element analysis is conducted to study the mutual interaction of two oblique surface cracks in rail under the wheel-rail full slip contact loading and frictional heating. In the present thermo-mechanical coupling finite element model, the heat-convection between the rail and ambient, heat transfer between the crack surfaces, and temperature-dependent material properties are taken into consideration. The variation of stress intensity factors with the distance between two cracks is investigated. The results reveal that the stress intensity factor K1 increases with an increase of the distance between the cracks. The effect of the distance between the cracks on the stress intensity factor range K2 is not significant.